chore: record journal

.trellis/workspace/dingkang/journal-1.md

@@ -152,3 +152,24 @@ Introduced blender/osmassets/features.py with FeatureHandler and dispatch_ways f
 ### Status
 
 [OK] **Completed**
+
+
+## Session 8: Clean stale tuft density comment
+
+**Date**: 2026-08-03
+**Task**: Clean stale tuft density comment
+**Branch**: `main`
+
+### Summary
+
+Cleared stale D3 tuft_density_wave comment debt and updated parity guide known-defect records without changing executable scene generation logic. Verified py_compile, 51 pure tests, and task validation.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `f569d45` | (see git log) |
+
+### Status
+
+[OK] **Completed**